Module: Polytexnic::Preprocessor::Latex

Included in:
Polytexnic::Preprocessor
Defined in:
lib/polytexnic/preprocessors/latex.rb

Instance Method Summary collapse

Instance Method Details

#clean_latex_document ⇒ Object

Returns LaTeX with hashed versions of literal environments. Literal environments are hashed and passed through the pipeline so that we can process things like refs and hyperrefs using gsubs.



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# File 'lib/polytexnic/preprocessors/latex.rb', line 14

def clean_latex_document
  cache_literal(@polytex, :latex).tap do |doc|
    expand_input!(doc,
                  Proc.new { |source| cache_literal(source, :latex) },
                  'tex')
  end
end

#convert_gifs(text) ⇒ Object

Convert GIFs to PNGs. Unfortunately, xelatex doesn’t support GIFs. This converts the included filenames to use ‘.png’ in place of ‘.gif’. When used with the Softcover system, the correct PNG files are automatically created on the fly.



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# File 'lib/polytexnic/preprocessors/latex.rb', line 26

def convert_gifs(text)
  text.tap do
    text.gsub!(/\\(includegraphics|image|imagebox)\{(.*)\.gif\}/) do
      "\\#{$1}{#{$2}.png}"
    end
  end
end

#polish_tables(text) ⇒ Object 



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# File 'lib/polytexnic/preprocessors/latex.rb', line 34

def polish_tables(text)
  text.tap do
    text.gsub!(/^\s*(\\begin\{table\})/) do
      "#{$1}\n\\begin{center}\n\\small\n"
    end
    text.gsub!(/^\s*(\\end\{table\})/) { "\\end{center}\n#{$1}" }
  end
end

#process_asides(text) ⇒ Object

Processes aside environments. In order to get nice framed & shaded aside boxes, we need to transform the default aside into a new environment.



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# File 'lib/polytexnic/preprocessors/latex.rb', line 46

def process_asides(text)
  # Transform asides with labels and headings.
  aside_regex = /\\begin{aside}\n\s*
                 \\label{(.*?)}\s*
                 \\heading{(.*?)}\n
                 (.*?)
                 \\end{aside}/mx
  text.tap do
    text.gsub!(aside_regex) do
      %(\\begin{shaded_aside}{#{$2}}{#{$1}}\n#{$3}\n\\end{shaded_aside})
    end
  end
end

#to_processed_latex ⇒ Object 



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# File 'lib/polytexnic/preprocessors/latex.rb', line 5

def to_processed_latex
  @polytex = convert_gifs(
               polish_tables(
               process_asides(clean_latex_document)))
end